First of all Welcome to the forum! Nice little scooter you bought. One of Yamaha's line of 50cc 2 stroke scooters and that's whay you can't find a oil plug, 2 strokers don't have oil in the engine case. If you're talking about the transmission then look in the service manual starting on page 27:
Nice little scooter you bought. One of Yamaha's line of 50cc 2 stroke scooters and that's whay you can't find a oil plug, 2 strokers don't have oil in the engine case. If you're talking about the transmission then look in the service manual starting on page 27: